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    <ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../inform7n.html">Inform7</a></li><li><a href="index.html">knowledge</a></li><li><a href="index.html#3">Chapter 3: Properties</a></li><li><b>Same Property Relation</b></li></ul></div>
<p class="purpose">Each value property has an associated relation to compare its value between two owners.</p>

<ul class="toc"><li><a href="3-spr.html#SP1">&#167;1. Family</a></li><li><a href="3-spr.html#SP2">&#167;2. Stock</a></li><li><a href="3-spr.html#SP6">&#167;6. Typechecking</a></li></ul><hr class="tocbar">

<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. Family.</b></p>

<pre class="displayed-code all-displayed-code code-font">
<span class="identifier-syntax">bp_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">same_property_bp_family</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>

<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">SameAsRelations::start</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">SameAsRelations::start</span></span>:<br/>Knowledge Module - <a href="1-km.html#SP3">&#167;3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">same_property_bp_family</span><span class="plain-syntax"> = </span><span class="identifier-syntax">BinaryPredicateFamilies::new</span><span class="plain-syntax">();</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">same_property_bp_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">STOCK_BPF_MTID</span><span class="plain-syntax">, </span><a href="3-spr.html#SP2" class="function-link"><span class="function-syntax">SameAsRelations::stock</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">same_property_bp_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">TYPECHECK_BPF_MTID</span><span class="plain-syntax">, </span><a href="3-spr.html#SP6" class="function-link"><span class="function-syntax">SameAsRelations::typecheck</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. Stock.</b>If, for example, there is a value property called "height" then we make a
relation to serve as the meaning of "the same height as" in text like this:
</p>

<blockquote>
    <p>if Ms Cregg is the same height as Big Bird, ...</p>
</blockquote>

<p class="commentary">We have two schemas, because it now<sup id="fnref:1"><a href="#fn:1" rel="footnote">1</a></sup> makes sense not only to perform
the comparison but also to force it true thus:
</p>

<blockquote>
    <p>now Ms Cregg is the same height as Big Bird;</p>
</blockquote>

<ul class="footnotetexts"><li class="footnote" id="fn:1"><p class="inwebfootnote"><sup id="fnref:1"><a href="#fn:1" rel="footnote">1</a></sup> That couldn't be arranged for strict inequality comparisons like "taller
than" &mdash; see <a href="3-cr.html" class="internal">Comparative Relations</a> &mdash; because it is unclear just how much
taller than Big Bird we would have to make C. J.
<a href="#fnref:1" title="return to text"> &#x21A9;</a></p></li></ul>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">SameAsRelations::stock</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">SameAsRelations::stock</span></span>:<br/><a href="3-spr.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">bp_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">self</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">n</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">n</span><span class="plain-syntax"> == </span><span class="constant-syntax">2</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prn</span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">LOOP_OVER</span><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">, </span><span class="reserved-syntax">property</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">            </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><a href="3-prp.html#SP16" class="function-link"><span class="function-syntax">Properties::is_value_property</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">)) &amp;&amp;</span>
<span class="plain-syntax">                (</span><span class="identifier-syntax">Wordings::nonempty</span><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">name</span><span class="plain-syntax">))) {</span>
<span class="plain-syntax">                </span><span class="identifier-syntax">vocabulary_entry</span><span class="plain-syntax"> *</span><span class="identifier-syntax">rel_name</span><span class="plain-syntax">;</span>
<span class="plain-syntax">                </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">i6_pname</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RTProperties::iname</span><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">);</span>
<span class="plain-syntax">                </span><span class="named-paragraph-container code-font"><a href="3-spr.html#SP2_1" class="named-paragraph-link"><span class="named-paragraph">Work out the name for the same-property-value-as relation</span><span class="named-paragraph-number">2.1</span></a></span><span class="plain-syntax">;</span>

<span class="plain-syntax">                </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">relname</span><span class="plain-syntax">)</span>
<span class="plain-syntax">                </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">relname</span><span class="plain-syntax">, </span><span class="string-syntax">"%V"</span><span class="plain-syntax">, </span><span class="identifier-syntax">rel_name</span><span class="plain-syntax">);</span>
<span class="plain-syntax">                </span><span class="identifier-syntax">binary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">bp</span><span class="plain-syntax"> =</span>
<span class="plain-syntax">                    </span><span class="identifier-syntax">BinaryPredicates::make_pair</span><span class="plain-syntax">(</span><span class="identifier-syntax">same_property_bp_family</span><span class="plain-syntax">,</span>
<span class="plain-syntax">                        </span><span class="identifier-syntax">BPTerms::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">), </span><span class="identifier-syntax">BPTerms::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">),</span>
<span class="plain-syntax">                        </span><span class="identifier-syntax">relname</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">,</span>
<span class="plain-syntax">                        </span><span class="identifier-syntax">Calculus::Schemas::new</span><span class="plain-syntax">(</span><span class="string-syntax">"*1.%n = *2.%n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">i6_pname</span><span class="plain-syntax">, </span><span class="identifier-syntax">i6_pname</span><span class="plain-syntax">),</span>
<span class="plain-syntax">                        </span><span class="identifier-syntax">Calculus::Schemas::new</span><span class="plain-syntax">(</span><span class="string-syntax">"*1.%n == *2.%n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">i6_pname</span><span class="plain-syntax">, </span><span class="identifier-syntax">i6_pname</span><span class="plain-syntax">),</span>
<span class="plain-syntax">                        </span><span class="identifier-syntax">WordAssemblages::lit_1</span><span class="plain-syntax">(</span><span class="identifier-syntax">rel_name</span><span class="plain-syntax">));</span>
<span class="plain-syntax">                </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">relname</span><span class="plain-syntax">)</span>
<span class="plain-syntax">                </span><span class="identifier-syntax">bp</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">family_specific</span><span class="plain-syntax"> = </span><span class="identifier-syntax">STORE_POINTER_property</span><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">);</span>
<span class="plain-syntax">                </span><a href="3-spr.html#SP5" class="function-link"><span class="function-syntax">SameAsRelations::register_same_property_as</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">,</span>
<span class="plain-syntax">                    </span><a href="3-prp.html#SP14" class="function-link"><span class="function-syntax">Properties::get_name</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">));</span>
<span class="plain-syntax">            }</span>
<span class="plain-syntax">        }</span>
<span class="plain-syntax">    }</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. </b>The family-specific data in this family is just a pointer to the property:
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="function-syntax">SameAsRelations::bp_get_same_as_property</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">bp</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">bp</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">relation_family</span><span class="plain-syntax"> != </span><span class="identifier-syntax">same_property_bp_family</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">bp</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">right_way_round</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">RETRIEVE_POINTER_property</span><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">family_specific</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>&#167;4. </b>When we make one of these, we also make a prepositional form, as in the
example "the same height as":
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="function-syntax">&lt;same-property-as-construction&gt;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">the</span><span class="plain-syntax"> </span><span class="identifier-syntax">same</span><span class="plain-syntax"> ... </span><span class="identifier-syntax">as</span>
</pre>
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>&#167;5. </b></p>

<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">SameAsRelations::register_same_property_as</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">SameAsRelations::register_same_property_as</span></span>:<br/><a href="3-spr.html#SP2">&#167;2</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">binary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">root</span><span class="plain-syntax">,</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Wordings::empty</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">verb_meaning</span><span class="plain-syntax"> </span><span class="identifier-syntax">vm</span><span class="plain-syntax"> = </span><span class="identifier-syntax">VerbMeanings::regular</span><span class="plain-syntax">(</span><span class="identifier-syntax">root</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">preposition</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prep</span><span class="plain-syntax"> =</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">Prepositions::make</span><span class="plain-syntax">(</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">PreformUtilities::merge</span><span class="plain-syntax">(</span><span class="function-syntax">&lt;same-property-as-construction&gt;</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">,</span>
<span class="plain-syntax">                </span><span class="identifier-syntax">WordAssemblages::from_wording</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)), </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">, </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">Verbs::add_form</span><span class="plain-syntax">(</span><span class="identifier-syntax">copular_verb</span><span class="plain-syntax">, </span><span class="identifier-syntax">prep</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">vm</span><span class="plain-syntax">, </span><span class="identifier-syntax">SVO_FS_BIT</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP2_1" class="paragraph-anchor"></a><b>&#167;2.1. </b>In I7 source text, this relation is called "same-height-as", but we don't
mention this in the documentation because (for timing reasons) it doesn't
exist when the new-verb sentences are being parsed: so writing
</p>

<blockquote>
    <p>The verb to be level with implies the same-height-as relation.</p>
</blockquote>

<p class="commentary">cannot work. Nothing is really lost by this, since it's easy enough to
define an identically-behaving relation by hand:
</p>

<blockquote>
    <p>Levelling relates a person (called Mr X) to a person (called Mr Y) when the height of Mr X is the height of Mr Y.</p>
</blockquote>

<blockquote>
    <p>The verb to be level with implies the levelling relation.</p>
</blockquote>

<p class="commentary">Relations need to have single-word names, but properties don't, so we shrink
spaces to hyphens: thus, for instance, "same-carrying-capacity-as".
</p>

<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Work out the name for the same-property-value-as relation</span><span class="named-paragraph-number">2.1</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">i7_name</span><span class="plain-syntax">)</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">i7_name</span><span class="plain-syntax">, </span><span class="string-syntax">"same-%&lt;W-as"</span><span class="plain-syntax">, </span><span class="identifier-syntax">prn</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">name</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">LOOP_THROUGH_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">pos</span><span class="plain-syntax">, </span><span class="identifier-syntax">i7_name</span><span class="plain-syntax">)</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::get</span><span class="plain-syntax">(</span><span class="identifier-syntax">pos</span><span class="plain-syntax">) == </span><span class="character-syntax">' '</span><span class="plain-syntax">) </span><span class="identifier-syntax">Str::put</span><span class="plain-syntax">(</span><span class="identifier-syntax">pos</span><span class="plain-syntax">, </span><span class="character-syntax">'-'</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">I7W</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Feeds::feed_text_expanding_strings</span><span class="plain-syntax">(</span><span class="identifier-syntax">i7_name</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">rel_name</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Lexer::word</span><span class="plain-syntax">(</span><span class="identifier-syntax">Wordings::first_wn</span><span class="plain-syntax">(</span><span class="identifier-syntax">I7W</span><span class="plain-syntax">));</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">i7_name</span><span class="plain-syntax">)</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="3-spr.html#SP2">&#167;2</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>&#167;6. Typechecking.</b>We just let the standard machinery do its work.
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">SameAsRelations::typecheck</span><button class="popup" onclick="togglePopup('usagePopup4')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup4">Usage of <span class="code-font"><span class="function-syntax">SameAsRelations::typecheck</span></span>:<br/><a href="3-spr.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">bp_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">self</span><span class="plain-syntax">, </span><span class="identifier-syntax">binary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">bp</span><span class="plain-syntax">,</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> **</span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> **</span><span class="identifier-syntax">kinds_required</span><span class="plain-syntax">, </span><span class="identifier-syntax">tc_problem_kit</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tck</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">DECLINE_TO_MATCH</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
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